10 



BULLETIN 244, U. S. DEPARTMENT OF AGRICULTURE. 



Figure 3, based on measurements of 34 well-stocked shortleaf pine 

 stands in Arkansas, represents graphically the proportion of clear 

 length to crown length for trees of various heights on the better and 

 poorer quality of situations. 



The lengths of the crown and clear stem and their proportion of 

 the total height of the tree are given in Table 3. In New Jersey 

 70-year-old stands 65 feet high had practically the same actual depth 

 of canopy as vigorous stands 50 years old and 80 feet in height in 

 Arkansas. The proportion of clear length to total height in New 



55 -46 39 32 25 /8 /O 5 C 4 8 /3 /3 25 3/ '38 -?6 

 Clear CertytfC of ' Tre&'oelow Crown* — feeh. 



Fig. 3.— Relative proportions of clear length and crown depth for shortleaf pine of various heights on better 

 and poorer qualities of site in Arkansas. 



Jersey was about 48 per cent, as compared with 70 per cent for the 

 better stands in Arkansas. 



Table 3. — Clear length and crown length of dominant trees in well-stocked stands of 



shortleaf pine in Arkansas. 



Total height of tree (feet). 



10 

 20 

 30 

 40 

 50 

 60 

 70 

 80 

 90 



Better ouality site. 



Clear length. 



Crown 



Feet. 



Per ct. 



Feet. 



5 



50 



5 



10 



50 



10 



18 



60 



12 



25 



63 



15 



32 



64 



18 



39 



65 



21 



46 



67 



24 



55 



69 



25 



63 



70 



27 



Per ct. 

 50 

 50 

 40 

 37 

 36 

 35 

 33 

 31 

 30 



Poorer quality site. 



Feet. 



ength. 



Crown 



Per ct. 



Feet. 



40 



6 



40 



12 



43 



17 



47 



21 



50 



25 



52 



29 



54 



32 



.)/ 



34 



60 



37 



Perct. 

 60 

 60 

 57 

 63 

 50 

 48 

 46 

 43 

 40 



CROWN SPREAD AND TREE DIAMETER. 



In well-stocked stands of shortleaf pine a very close relationship has 

 been found to exist between the diameter of the tree at breast height 

 and the diameter of the crown. This relationship is striking in its 



